Basler DECS-100 User Manual

9287500991 Rev K DECS-100 Maintenance and Troubleshooting 6-5
Overexcitation Shutdown Indicator is Annunciating
Step 1. Check for generator overloading.
If the generator is operating with a larger than rated load, shed load.
If the generator is operating with a rated or less than rated load, proceed to Step 2.
Step 2. Verify that the generator exciter field voltage requirements are compatible with the DECS-100.
If the exciter field voltage requirements are not compatible with the DECS-100, contact Basler
Electric Customer Service for recommendations.
If the exciter field voltage requirements are compatible with the DECS-100, proceed to Step 3.
Step 3. Replace the DECS-100.
If replacing the DECS-100 does not correct the malfunction, proceed to Step 4.
Step 4. Refer to the generator manual. Generator is defective.
Loss of Generator Sensing Indicator is Annunciating
Step 1. Verify that the voltage sensing leads are properly connected.
If the sensing leads are not properly connected, correct the connections.
If the sensing lead connections are correct, proceed to Step 2.
Step 2. For single-phase sensing, verify that E2 and E3 are connected.
If E2 and E3 are not connected, connect them both to phase C sensing voltage.
If E2 and E3 are properly connected, proceed to Step 3.
Step 3. Verify that the sensing potential transformer (if used) has the correct turns ratio and is
functioning properly.
If the sensing potential transformer has the wrong turns ratio or is malfunctioning, replace it.
If the sensing potential transformer is correct and functioning properly, proceed to Step 4.
Step 4. Verify that the generator output voltage is present on all phases.
If the generator is missing a phase, refer to the generator manual. Generator is defective.
If generator output voltage is balanced on all phases, proceed to Step 5.
Step 5 Replace the DECS-100.
Overexcitation Limiting Indicator is Annunciating
Step 1. Check for generator overloading.
If the generator is operating with a larger than rated load, shed load.
If the generator is operating with a rated or less than rated load, proceed to Step 2.
Step 2. Verify that the DECS-100 output (field) current limit is not set too low.
If the output current limit setpoint is too low, adjust for the proper setting.
If the output current limit is set properly, proceed to Step 3.
Step 3. Verify that the generator exciter field current requirements are compatible with the DECS-100.
If the generator exciter field current requirements are not compatible with the DECS-100,
contact Basler Electric Customer Service for recommendations.
If the generator exciter field current requirements are compatible with the DECS-100, proceed
to Step 4.
Step 4. Replace the DECS-100.
If replacing the DECS-100 does not correct the malfunction, proceed to Step 5.
Step 5. Refer to the generator manual. Generator is defective.
Underexcitation Limiting Indicator is Annunciating
Step 1. Verify that the DECS-100 generator voltage setpoint is not being driven to a lower level.
The setpoint can be affected by the Raise/Lower contact inputs or by the Auxiliary input.

Basler DECS-100 Specifications

General

Brand	Basler
Model	DECS-100
Category	Control Systems
Language	English